In:
European Journal of Inorganic Chemistry, Wiley, Vol. 2004, No. 11 ( 2004-06), p. 2369-2378
Abstract:
Three novel copper polymers, {[Cu 4 (tacn) 4 ( o ‐bda) 2 ](ClO 4 ) 4 (H 2 O) 2 } n ( 1 ), {[Cu(tacn)( m ‐bda)](CH 3 OH) 0.5 (H 2 O) 0.5 } n ( 2 ), and {[Cu 2 (tacn) 2 ( p ‐bda)](ClO 4 ) 2 } n ( 3 ) (tacn = 1,4,7‐triazacyclononane, bda = benzenedicarboxylic acid) have been synthesized and structurally characterized. Compound 1 belongs to the monoclinic space group C 2, while 2 and 3 crystallize in the orthorhombic space group Pmc 2(1) and the monoclinic space group P 2 1 / n , respectively. They are all 1D zigzag polymers, which can be considered as Cu(tacn) 2+ building units linked by isomers of benzenedicarboxylic acid. The variable‐temperature (2−300 K) magnetic behavior revealed the existence of ferromagnetic interactions in 1 and 2 . The best fittings of the experimental magnetic susceptibilities gave J = 4.0 cm −1 and g = 2.04 for 1 , J = 1.2 cm −1 , zJ′ = −0.18 cm −1 and g = 2.07 for 2 , whereas the exchange coupling between Cu II ions in 3 is antiferromagnetic with J = −13.1 cm −1 and g = 2.05. The transformation of interactions between copper ions from ferromagnetic to antiferromagnetic is closely related to the variations in the isomeric benzenedicarboxylic acids. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)
Type of Medium:
Online Resource
ISSN:
1434-1948
,
1099-0682
DOI:
10.1002/ejic.v2004:11
DOI:
10.1002/ejic.200300791
Language:
English
Publisher:
Wiley
Publication Date:
2004
detail.hit.zdb_id:
1475009-0
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